ProChain: A privacy-preserving blockchain-based supply chain traceability system model

The inherent immutability of blockchain technology offers a promising solution for product supply chain traceability. However, the open and transparent nature of the blockchain raises concerns about the vulnerability of shared product information and the identity information of participants in the supply chain to falsification. To address these concerns, we propose a privacy-preserving blockchain-based scheme for supply chain traceability. Our approach leverages zero-knowledge proof technology to enable participants to enter the system using a one-time pseudonym, thereby protecting their identity information. Additionally, we propose a secure and reliable method for sharing product information by using attribute encryption technology to encrypt product information stored in the blockchain. We set flexible access control policies for product information ciphertext through smart contracts. To validate our approach, we implemented a system prototype named ProChain on the Hyperledger Fabric platform. Our evaluation results demonstrate the effectiveness of our scheme in protecting the identity information of manufacturers and the shared product information of all participants in the traceability system.